*/
#include <linux/device.h>
+#include <linux/err.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/io.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/slab.h>
+#include <linux/gpio/machine.h>
+
+#include "gpiolib.h"
/* Private data structure for of_gpiochip_find_and_xlate */
struct gg_data {
enum of_gpio_flags *flags;
struct of_phandle_args gpiospec;
- int out_gpio;
+ struct gpio_desc *out_gpio;
};
/* Private function for resolving node pointer to gpio_chip */
return false;
ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
- if (ret < 0)
+ if (ret < 0) {
+ /* We've found a gpio chip, but the translation failed.
+ * Store translation error in out_gpio.
+ * Return false to keep looking, as more than one gpio chip
+ * could be registered per of-node.
+ */
+ gg_data->out_gpio = ERR_PTR(ret);
return false;
+ }
- gg_data->out_gpio = ret + gc->base;
+ gg_data->out_gpio = gpiochip_get_desc(gc, ret);
return true;
}
/**
- * of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API
+ * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
* @np: device node to get GPIO from
* @propname: property name containing gpio specifier(s)
* @index: index of the GPIO
* @flags: a flags pointer to fill in
*
- * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
* value on the error condition. If @flags is not NULL the function also fills
* in flags for the GPIO.
*/
-int of_get_named_gpio_flags(struct device_node *np, const char *propname,
- int index, enum of_gpio_flags *flags)
+struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+ const char *propname, int index, enum of_gpio_flags *flags)
{
/* Return -EPROBE_DEFER to support probe() functions to be called
* later when the GPIO actually becomes available
*/
- struct gg_data gg_data = { .flags = flags, .out_gpio = -EPROBE_DEFER };
+ struct gg_data gg_data = {
+ .flags = flags,
+ .out_gpio = ERR_PTR(-EPROBE_DEFER)
+ };
int ret;
/* .of_xlate might decide to not fill in the flags, so clear it. */
ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
&gg_data.gpiospec);
if (ret) {
- pr_debug("%s: can't parse gpios property\n", __func__);
- return ret;
+ pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
+ __func__, propname, np->full_name, index);
+ return ERR_PTR(ret);
}
gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
of_node_put(gg_data.gpiospec.np);
- pr_debug("%s exited with status %d\n", __func__, gg_data.out_gpio);
+ pr_debug("%s: parsed '%s' property of node '%s[%d]' - status (%d)\n",
+ __func__, propname, np->full_name, index,
+ PTR_ERR_OR_ZERO(gg_data.out_gpio));
return gg_data.out_gpio;
}
+
+int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
+ int index, enum of_gpio_flags *flags)
+{
+ struct gpio_desc *desc;
+
+ desc = of_get_named_gpiod_flags(np, list_name, index, flags);
+
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+ else
+ return desc_to_gpio(desc);
+}
EXPORT_SYMBOL(of_get_named_gpio_flags);
+/**
+ * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
+ * @np: device node to get GPIO from
+ * @name: GPIO line name
+ * @lflags: gpio_lookup_flags - returned from of_find_gpio() or
+ * of_parse_own_gpio()
+ * @dflags: gpiod_flags - optional GPIO initialization flags
+ *
+ * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
+ * value on the error condition.
+ */
+static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
+ const char **name,
+ enum gpio_lookup_flags *lflags,
+ enum gpiod_flags *dflags)
+{
+ struct device_node *chip_np;
+ enum of_gpio_flags xlate_flags;
+ struct gg_data gg_data = {
+ .flags = &xlate_flags,
+ };
+ u32 tmp;
+ int i, ret;
+
+ chip_np = np->parent;
+ if (!chip_np)
+ return ERR_PTR(-EINVAL);
+
+ xlate_flags = 0;
+ *lflags = 0;
+ *dflags = 0;
+
+ ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
+ if (ret)
+ return ERR_PTR(ret);
+
+ if (tmp > MAX_PHANDLE_ARGS)
+ return ERR_PTR(-EINVAL);
+
+ gg_data.gpiospec.args_count = tmp;
+ gg_data.gpiospec.np = chip_np;
+ for (i = 0; i < tmp; i++) {
+ ret = of_property_read_u32_index(np, "gpios", i,
+ &gg_data.gpiospec.args[i]);
+ if (ret)
+ return ERR_PTR(ret);
+ }
+
+ gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
+ if (!gg_data.out_gpio) {
+ if (np->parent == np)
+ return ERR_PTR(-ENXIO);
+ else
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (xlate_flags & OF_GPIO_ACTIVE_LOW)
+ *lflags |= GPIO_ACTIVE_LOW;
+
+ if (of_property_read_bool(np, "input"))
+ *dflags |= GPIOD_IN;
+ else if (of_property_read_bool(np, "output-low"))
+ *dflags |= GPIOD_OUT_LOW;
+ else if (of_property_read_bool(np, "output-high"))
+ *dflags |= GPIOD_OUT_HIGH;
+ else {
+ pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n",
+ desc_to_gpio(gg_data.out_gpio), np->name);
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (name && of_property_read_string(np, "line-name", name))
+ *name = np->name;
+
+ return gg_data.out_gpio;
+}
+
+/**
+ * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
+ * @chip: gpio chip to act on
+ *
+ * This is only used by of_gpiochip_add to request/set GPIO initial
+ * configuration.
+ */
+static void of_gpiochip_scan_gpios(struct gpio_chip *chip)
+{
+ struct gpio_desc *desc = NULL;
+ struct device_node *np;
+ const char *name;
+ enum gpio_lookup_flags lflags;
+ enum gpiod_flags dflags;
+
+ for_each_child_of_node(chip->of_node, np) {
+ if (!of_property_read_bool(np, "gpio-hog"))
+ continue;
+
+ desc = of_parse_own_gpio(np, &name, &lflags, &dflags);
+ if (IS_ERR(desc))
+ continue;
+
+ if (gpiod_hog(desc, name, lflags, dflags))
+ continue;
+ }
+}
+
/**
* of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
* @gc: pointer to the gpio_chip structure
{
/*
* We're discouraging gpio_cells < 2, since that way you'll have to
- * write your own xlate function (that will have to retrive the GPIO
+ * write your own xlate function (that will have to retrieve the GPIO
* number and the flags from a single gpio cell -- this is possible,
* but not recommended).
*/
}
EXPORT_SYMBOL(of_mm_gpiochip_add);
+/**
+ * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
+ * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
+ */
+void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
+{
+ struct gpio_chip *gc = &mm_gc->gc;
+
+ if (!mm_gc)
+ return;
+
+ gpiochip_remove(gc);
+ iounmap(mm_gc->regs);
+ kfree(gc->label);
+}
+EXPORT_SYMBOL(of_mm_gpiochip_remove);
+
#ifdef CONFIG_PINCTRL
-static void of_gpiochip_add_pin_range(struct gpio_chip *chip)
+static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
{
struct device_node *np = chip->of_node;
struct of_phandle_args pinspec;
struct pinctrl_dev *pctldev;
int index = 0, ret;
+ const char *name;
+ static const char group_names_propname[] = "gpio-ranges-group-names";
+ struct property *group_names;
if (!np)
- return;
+ return 0;
+
+ group_names = of_find_property(np, group_names_propname, NULL);
for (;; index++) {
- ret = of_parse_phandle_with_args(np, "gpio-ranges",
- "#gpio-range-cells", index, &pinspec);
+ ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
+ index, &pinspec);
if (ret)
break;
pctldev = of_pinctrl_get(pinspec.np);
if (!pctldev)
- break;
-
- ret = gpiochip_add_pin_range(chip,
- pinctrl_dev_get_devname(pctldev),
- pinspec.args[0],
- pinspec.args[1],
- pinspec.args[2]);
-
- if (ret)
- break;
+ return -EPROBE_DEFER;
+
+ if (pinspec.args[2]) {
+ if (group_names) {
+ of_property_read_string_index(np,
+ group_names_propname,
+ index, &name);
+ if (strlen(name)) {
+ pr_err("%s: Group name of numeric GPIO ranges must be the empty string.\n",
+ np->full_name);
+ break;
+ }
+ }
+ /* npins != 0: linear range */
+ ret = gpiochip_add_pin_range(chip,
+ pinctrl_dev_get_devname(pctldev),
+ pinspec.args[0],
+ pinspec.args[1],
+ pinspec.args[2]);
+ if (ret)
+ return ret;
+ } else {
+ /* npins == 0: special range */
+ if (pinspec.args[1]) {
+ pr_err("%s: Illegal gpio-range format.\n",
+ np->full_name);
+ break;
+ }
+
+ if (!group_names) {
+ pr_err("%s: GPIO group range requested but no %s property.\n",
+ np->full_name, group_names_propname);
+ break;
+ }
+
+ ret = of_property_read_string_index(np,
+ group_names_propname,
+ index, &name);
+ if (ret)
+ break;
+
+ if (!strlen(name)) {
+ pr_err("%s: Group name of GPIO group range cannot be the empty string.\n",
+ np->full_name);
+ break;
+ }
+
+ ret = gpiochip_add_pingroup_range(chip, pctldev,
+ pinspec.args[0], name);
+ if (ret)
+ return ret;
+ }
}
+
+ return 0;
}
#else
-static void of_gpiochip_add_pin_range(struct gpio_chip *chip) {}
+static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
#endif
-void of_gpiochip_add(struct gpio_chip *chip)
+int of_gpiochip_add(struct gpio_chip *chip)
{
+ int status;
+
if ((!chip->of_node) && (chip->dev))
chip->of_node = chip->dev->of_node;
if (!chip->of_node)
- return;
+ return 0;
if (!chip->of_xlate) {
chip->of_gpio_n_cells = 2;
chip->of_xlate = of_gpio_simple_xlate;
}
- of_gpiochip_add_pin_range(chip);
+ status = of_gpiochip_add_pin_range(chip);
+ if (status)
+ return status;
+
of_node_get(chip->of_node);
+
+ of_gpiochip_scan_gpios(chip);
+
+ return 0;
}
void of_gpiochip_remove(struct gpio_chip *chip)
{
gpiochip_remove_pin_ranges(chip);
-
- if (chip->of_node)
- of_node_put(chip->of_node);
+ of_node_put(chip->of_node);
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff